"IMM" wrote in message
...

"John Stumbles" ] wrote in message
...
"Mitch" wrote in message
...
I had a gas safety check on a Bosch 24i combi and the man said that
the
pressure relief pipework was sub-standard as it simply runs from the
boiler
to the floor with the exit inside rather than an external exit.

Can someone please tell me what the Building Regs require as I am
thinking
of correcting this myself (especially as the main work is do drill a
hole)?
EG is it 15mm or 22mm pipe, what are restrictions on the exit, such as
is
it
downward facing etc etc.

Also where could I read or access these regs?

I don't know which regs cover it - it certainly should be in the
manufacturer's installation instructions - but it should terminate
outside
a
few inches from, and facing, the ground; so that if/when the pressure
relief
valve opens the blast of potentially boiling water + steam can hit the
ground without injuring anyone. 15mm is generally used.

Not quite. 15mm pipe, outside at a low level and the pipe being turned
into
the wall using an elbow. If boiling water/steam is lets off it hits the
wall. The pipe need not be sleeved going through the wall.

Also you can terminate inside a garage (integral garage or not). There
again at low level and the pipe turning into the wall. It can terminate
onto a flat roof too, one gains at low level and turning into the wall.




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